Bulldozer blade attachment



April 26, 1949.

R. W. SMITH BULLDOZER BLADE ATTACHMENT Filed April 8, 1947 INVENTOR ATTORNEYS.

Patented Apr. 26, 1949 UNITED STATES PATENT OFFICE BULLDOZER BLADE ATTACHMENT Roy W. Smith, Borger, Tex.

Application April 8, 1947, Serial No. 740,118

1 Claim.

This invention relates to a digging attachment designed for use on bull dozer blades.

The primary object of the invention is to provide a plurality of curved spikes pivotally mounted on the rear surface of a bulldozer blade, the spikes being so constructed and arranged that upon forward movement of the blade in pushing or scraping dirt, the spikes will swing upwardly and ride over the ground surface, while upon reverse movement of the blade, the spikes will dig into the ground surface, loosening the ground surface, roots or the like, so that when the blade is moved forwardly with the bull dozer, the earth and roots dislodged by the spikes, may be readily pushed forwardly.

An important object of the invention is to provide spikes of this character which may be readily and easily moved into and out of operation, means being also provided for adjusting the spikes for operation at the desired depth.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts, hereinafter more fully described and pointed out in the claim, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

Referring to the drawing Figure 1 is a perspective view of a bull dozer blade, taken from the rear thereof, illustrating spikes, constructed in accordance with the invention, as pivotally mounted thereon.

Figure 2 is a vertical sectional View through the bull dozer blade, illustrating one of the spikes as secured thereto.

Figure 3 is a fragmental sectional View illus trating a modified form of spike.

Referring to the drawing in detail, the reference character 5 illustrates the usual curved bull dozer blade which is of the usual and well-known construction, the blade being provided with spaced curved plates 6 arranged in pairs along the rear surface of the blade, as clearly shown by Figure 1 of the drawing.

These plates provide supports for the spikes l which are curved rearwardly, the spikes being formed with extensions 8 at their upper ends, the extensions 8 being downwardly inclined and spaced from the main portions of the spikes 1, providing an opening for the reception of the pivot pins 9 on which the spikes are mounted.

The extensions ll are formed with slots, between which the pivoted looks it are mounted, the pivoted locks having shoulders ll adapted to fall down over the pins 9, when the spikes l are dropped into position, thereby locking the spikes to the plates 8. Each lock is formed with an elongated opening l2 in which the pin l3 of the extension moves, the pin restricting movement of the pivoted locks.

Connected with the pivoted locks it), are cables M that are wound on the shaft l5 which operates in bearings I6 formed in the end plates 6'. A crank handle I! is secured to one end of the shaft 15 and affords means whereby the shaft l5 may be rotated to wind or unwind the cables !4. The locking lever it moves over the ratchet l9 mounted on the shaft 15, to hold the shaft against rotation, after the spikes have been properly adjusted by the shaft.

Aligned openings are formed in the plates 6, and accommodate the pins 9 which pins are adapted to engage the curved outer edges of the spikes l, and restrict movement of the spikes in one direction. These pins 9, by adjusting them vertically, will act as means to regulate the depth of operation of the spikes.

The reference character 21 indicates the usual beams by means of which the bull dozer blade is supported on the bull dozer frame.

In the form of the invention as shown by Figure 3 of the drawing, the reference character 22 indicates a spike which is pivotally supported between plates 23 secured to the rear surface of the blade 24. By adjusting the pivot pin 25, the depth of operation of the spike 22 may be adjusted. While I have shown and described a single spike in Figure 3 of the drawing, it is to be understood that there will be a number of these spikes arranged in spaced relation with respect to each other longitudinally of the bull dozer blade with which it is used.

In the operation of the spikes, it will be obvious that as the bull dozer blade is moved forwardly in a scraping operation, the spikes will pivot rearwardly and ride over the ground surface. Upon reverse movement of the bull dozer blade, the spikes will be caused to dig into the ground surface, loosening the ground and roots contacted therewith so that upon reverse or forward movement of the bull dozer and blade, the blade will scrape and push the loosened dirt and roots, to clear the surface.

What is claimed is:

In a bull dozer blade, a plurality of curved spikes, pivot pins secured to the rear of the blade, pivoted locks carried by the spikes and adapted to engage said pivot pins removably securing the spikes to the blade, means for adjusting the spikes vertically, regulating the depth of operation of The following references are of record in the file of this patent:

UNITED STATES PATENTS 10 Number Name Date 2,042,196 Senz May 26, 1936 2,081,192 Allin et al May 25, 1937 2,219,160 White Oct. 22, 1940 2,396,739 McCauley Mar. 19, 1946 

